JPH11507193A - Electroacoustic diffusion device with a diaphragm made of balsa wood, a spider and a horn or a mixture thereof - Google Patents

Abstract

(57) Abstract: An electroacoustic diffusion device according to the present invention includes a diaphragm (2), a spider (3), and a coupling horn (11 or 12), all of which are balsa wood or a mixture thereof. And a natural and comfortable tone can be reproduced.

Description

Description: TECHNICAL FIELD The present invention relates to a diaphragm made of balsa wood, a diaphragm made of balsa wood, and a balance. An electroacoustic diffusion device comprising a trumpet or a mixture thereof. BACKGROUND OF THE INVENTION It is well known that electro-acoustic diffusers (also called loudspeakers) convert electrical signals into acoustic energy, usually by vibrating conical, dome-shaped, or flat diaphragms. The material used for the diaphragm is the basis for obtaining the desired electroacoustic characteristics. Research to obtain the best response from the viewpoint of electroacoustic and psychoacoustic effects, and research on sound timbre, will eventually use materials that determine characteristics such as lightness, distortion characteristics, and vibration resistance. It is supposed to. If the weight is light, high frequencies can be correctly reproduced, while the distortion characteristics determine the sound pressure without distortion due to deformation of the material. Finding a material with the above characteristics is easy. Optimum electro-acoustic characteristics have been obtained by using materials derived from the aerospatial technology. These materials provide well-reproduced sounds but special tones far from natural tones. One of the reasons that led to the use of cellulose, which is currently the most popular material, is that its tone is the most natural compared to other harder and heavier materials. Mixtures of metal and synthetic materials have also been used. The aim is always to obtain lightness, distortion characteristics and the correct timbre. The main problem remains to obtain a sound that is as natural as possible, which is acceptable as a non- "colored" sound, ie a pleasant coloration. The diaphragm is made of fir-trees to reproduce the sound as naturally as possible. Even though they are very solid, fir trees have the right timbre, but have the problem of being unacceptably heavy except at low frequencies. The diffusers are made from different lengths of vibrating wood stripes so as to have different masses depending on the frequency to be reproduced. However, the capacity to obtain electrokinetic, ie rapid changes in sound pressure, is rather reduced by the physical structure. Stripes in diffusers always have considerable inertia due to their total weight. DISCLOSURE OF THE INVENTION It is an object of the present invention to provide an electroacoustic that can be heard comfortably with minimal coloring, without the use of techniques that feature diffusers using technically known materials, in addition to balance and trumpet. The purpose is to realize a diaphragm with good response. The object for electro-acoustic diffusion can be achieved with the device according to the invention mainly comprising: A triangular piece made of balsa wood pieces (having a thickness of 0.5 mm to 5 mm), cut in such a way that the fiber structure prevents deformation, folded with steam and glued, And a loudspeaker cut into a truncated cone-shaped recess, which is a typical form of a speaker, and a balsa wood whose thickness varies with frequency, diffusers and subwoofers for high, medium, and low tones This prevents the coil from contacting the fixed part of the magnetic circuit that oscillates with the diaphragm, so that the coil moves in the direction coaxial with the air gap of the magnet. Mechanically linked to the same vibration, the diaphragm, which acts like a sound source by itself, behaves as if vibrating, and is made of balsa wood or in the end face with a coil glued in the center In the center, the elasticity of the wooden stripes allows the coil to move without interfering with the fixed parts of the loudspeaker, in the center, due to the elasticity of the wooden stripes. Balanced, cut, creased with steam and made of glued balsa wood, usually with a natural tone different from those obtained from plastic, metal or other wood Conversely, because of its natural macromolecular structure and its lightness, the trumpet vibrates and transmits vibrations from balsa wood does not change the sound, on the contrary it has a special natural tone, Furthermore, unlike the material used to form filters that cut high frequencies due to its light weight, balsa wood can also transmit high-frequency vibrations It consists of. In a possible variant of the device according to the invention, the diaphragm is obtained by bending appropriately cut balsa burls with steam and gluing them in one place and bending them to obtain tensioned fibers, even if they are radially If not, it shows perfect stiffness. Such a speaker provides a completely satisfactory electroacoustic response with a natural and pleasant tone. In fact, while the light weight of the diaphragm allows the reproduction of high frequencies, the complex of artificially obtained wood molecular structure, not natural, vibrates with a tone similar to a certain musical instrument. An alternative diffuser could be a flat diaphragm with a large surface, such as a commonly produced flat diffuser. The diffuser is vibrated by the coil adhered to the diaphragm, resulting in a very good tone, even with a reduced electrokinetic tone, with respect to the tone obtained with a conical diaphragm speaker. This is typical for flat diffusers, since realizing them makes it impossible for the diaphragm to vibrate to a considerable extent. The device according to the invention has a number of advantages: Due to the molecular structure of balsa wood and its light weight, the components described give the speaker a clear, natural and pleasant tone. Like one of all types of wood, the density of balsa wood is not uniform. Therefore, a slightly different tone can be obtained like a musical instrument. And this is not a disadvantage, and it is possible to obtain different diffusers with great potential to get a toned or warm tone. The porosity of balsa wood depends on the wood, and the quality of the wood is changing further. Depending on the quality of the balsa wood, the desired tone change is always obtained. In a manner similar to one of the traditional operations of wood, balsa wood is filled with oil or resin and painted. The effects of the quality of the wood and the effects of processing similar to them appear on the instrument. This ultimately requires a connection to the acoustoelectric effect, but opens up the possibility of obtaining different diffusers from each other. BRIEF DESCRIPTION OF THE DRAWINGS The present invention is described in detail below with reference to the accompanying drawings showing two embodiments. FIG. 1 is an exploded view of an electroacoustic diffusion device with a conical diaphragm according to the present invention. FIG. 2 is a side view of a variant of the device according to the invention with a dome-shaped diaphragm. 3 and 4 are side views of a trumpet made of balsa wood and two diffusers, each shaped as a folded trumpet. DETAILED DESCRIPTION The accompanying drawings show an electroacoustic diffusing device with a balanced diaphragm and trumpet, or a mixture thereof, made of balsa wood. The device for electroacoustic diffusion consists of a suspension 1, a triangular piece of balsa wood, bent and glued by steam, a truncated conical diaphragm 2 with fibers arranged in the radial direction, and a balsa wood, glued in the center A balance 3 formed from balsa wood stripes fixed at the ends with coiled ends, which does not move laterally due to the elasticity of the wooden stripes and allows the coils to move without interfering with the fixed parts of the loudspeaker; And an electroacoustic structure comprising an upper plate 5, a magnet 6, a coil 7 and a lower plate 8, cut from balsa wood and bent with steam and liquid And a coupling trumpet 11 or 12 suitable for transmitting high-frequency vibrations due to its light weight. In the modification of FIG. 2, a dome-shaped diaphragm made of balsa wood and a fixed flange 10 are shown. 3 and 4, the trumpet 11, the folded trumpet 12, the reflector 13 and the bottom 14 are shown in detail. According to the present invention, similar results for electroacoustic conversion, timbre, and electrokinetic response are obtained by using a mixture of balsa wood, which is obtained by cutting fibers into thin stripes and bonding them in the desired shape. And, of course, it can also be obtained by grinding the balsa wood and mixing it with different kinds of binders in order to obtain the dough of the desired shape. Further drying or heating can result in a diaphragm that is lighter than ordinary cellulosic fabric due to the macroscopic molecular structure typical of balsa wood and the results needed when used in the acoustic diffuser described above. .

Claims (1)

[Claims] 1. Balsa wood diaphragm, balance, trumpet or a mixture thereof With coalescence,   Suspension (1),   Consists of triangular pieces of balsa wood, folded and glued with steam, radially with fibers A positioned truncated cone shaped diaphragm (2);   Balsa wood strike made of balsa wood and fixed at the end face with a coil bonded in the center It is formed by rips, does not move laterally due to the elasticity of the wooden stripes, and Balance (3) that can move the coil without interfering with the fixed parts of the car,   A basket (4) for supporting the components of the speaker;   An electrode comprising an upper plate (5), a magnet (6), a coil (7), and a lower plate (8). Aeroacoustic structure, In order to transmit high frequency vibrations due to its light weight, balsa wood is cut and steam and flow And a connecting trumpet (11) or (12) bent by a body. Electroacoustic diffusion device. 2. 2. The dome-shaped diaphragm (9) is made of balsa wood. The described device. 3. The diaphragm bends the appropriately cut balsa wood bar with steam and Glue in place and bend the fiber into a stretched state The device of claim 1. 4. The diffuser has a large surface, similar to a flat diffuser that you normally produce It is made of a flat diaphragm and vibrates with a coil bonded to the diaphragm. The device of claim 1, wherein the device comprises 5. The components are obtained from a blend of balsa wood and the fibers are cut into thin stripes. Cut and glued or mixed with powdered balsa wood with binder The device of claim 1, wherein the device is molded and dried.